Electric motor.



B. G. HOFFMANN, DEGD.

A. w KIDDLB $15M. BEQKEE, xxnouw'ons. ELECTRIC MOTOR.

APPLICATION FILED. JULY- 21, 1907.

Patented Feb. 1 1915 'oU'IfiwS SF SAID HOFFMANN,

- ALTEHED KZTDELE DECK AS1313 cation 0 hp glicaiziozi filed July 55?,

172; 422i whom it mag/concern Be ib known that Elms: Gosra MANN, acitizen of lhe United Stai -cs, resid Zing iii the city of New Rochelle,in the county of Westchesler, in :he Stali'e of New York, have inventedcertain new and useful Improvements in Electric Motors, of which thefollowing is a specification, reference be ing had to the accompanyingdrawings, forming a part hereof.

This invention relates to electric motors and especially to slow speedelectric motors in which the armatures are of considerable diameter andWeight.

The objects of the invention are to enable motors of the type meniioned'30 he made more compact as regards length, to pro-secs the hearings efiectually from dusfi, etc, and to better adapt such motors 101 directcoupling to the driven part, esp *ially in the application 01' suchmotors to the propulsion of motor vehicles.

in the improved motor the hearings I01" the armature shaft are supporedWholly within the field casing, so that l ai'ings external to suchcasingare dis enseo with, and the coupling between the, armature shaftand 'the driving shaft is located within the chambered or hollowedarmature shaft and within che ends of lhe field casing. These and otherfeatures improvement will he more particularly explained hereinafterwith reference to she accompanying drawings in whi the invention isillustrated in several d1 erefic erahodiments and in which The solefigure is a view partly in longitudinal section and partly in elevationof a twin moitor which embodies the inv ition.

i the embodiment of ihe invention as shown in the drawing the casing hascase with it the end,'or intermediale plate a, which is common to bo'ihof ice 'cwin niotors, and has at each end tl'e' of she end plafes ofsecured thereto by 53s {5 deer that the motor may directly support thearmature 0 there is secured in he olate a a siiai'ciouary shaft a 1'through suitable hearings o, rece v "he armature l mit 0 This a '1 illend the ai'aiat In or ow. Ecrial no. asasce.

the hollow armature shafi ends ol the case a, but it is and between thepreferably placed may extend a material distance into the hollowrotatable armature shafts It will he observed that the driving sh; n

j are coup d to the armature shafts between the end plates a so thatwhen the motor is employed. for'example, in lhe propulsion of a motelvehicle, and to driving shaft is connec ced at its other end so thedriving Wheel of a vehicle, the possible length of ihe driving shaft fis less limited than would be ihe case if is were coupled to thearnzaiure shaft outside of the casing, and the range or angulardisplacement of the driving shaft necessary to accommodate the relativemove ment of the motor and driving wheel is reduced. Due to theconstruction previously dose: ihed, is will also he noted that ihe motoroccupies longitudinally of its axis the mini mum of space, and that thearmature bearings are Wholly inclosed Within the casing and protectedfrom the dust. is, of course, unnecessary herein to descrih in detailthe construction. of the bearings, c nunucators or controllers, as theymay he of any ordinary or suitable character. It will furthermore henoted that various changes in the details of construction and zhearrangements oi the parts may he made withouii departing from thespiritand scope of the invention.

1 claim as my invention,

1. A twin motor construction having a casing, two sets of coils,rotating :1"- maturcs, a fixed carried h said casing upon which saidarma'iures rotate sai casing comprising an integral. outer member ichinwhich there is located ihe two sets or" ield coils and also beingprovided between said field coils with an intermediate la't member thatserves at least a par l ippoi-t for the fixed shaft, the armabeinglocated upon the opposite sides id intermediate plate member.

motor consiruction having a casing,

love sets 1 held coils supp-oi'tc within said caslng, armaturescooperating with said i '1 1 am a. y 4 m, ,iclo col s anr a s hlioCUI'lcJllCdOll loi sapporiing said armaiures, said casing I innendcasings chereof and case an intermediaie casing a partition or plateWhich carries supports for adjacent ends of the armatures. I

4. A motor construction comprising in combination a casing havingtherein and integral therewith intermediate support, a fixed shaftcarried. by and extending on opposite sides of the intermediate supportand armatures located upon opposite sides of the intermediate supportand revolubly mounted-on the fixed shaft.

5. A motor construction comprising in combination a casing havingtherein and integral therewith an intermediate support, a fixed shafthaving portions on opposite sides of the support, armatures located onopposite sides of the intermediate supports and revolubly mounted onsaidfixed shaft, a driving shaft having a flexible connection with one ofthe armatures and extending in one direction, and another driving shafthaving a flexible connection with another of the armatures and extendingin the opposite direction to that in which the first mentioned drivingshaft extends.

This. specification signed and witnessed this 22d day of July, 1907.

ERNST GUSTAV HOFFMANN.

' Signed in the presence of- W'. B. GREELEY, Looms E. VARNEY.

